<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
    class Person {
        constructor(){
            this.name=null;
        }
        getName(){
            console.log(this.name);
        }

    }
    const xz=new Person();
    xz.name='项总';
    xz.getName()// this?
    const ysg =new Person();
    ysg.name='袁总';
    ysg.getName(); 

//    const getName = xz.getName.bind(ysg);
//    getName();

    //立即执行
    xz.getName.call(ysg)

    console.log(this==window);
    </script>
</body>
</html>